I am in a similar spot right now. If it is concrete advice you want, here are the things that keep me functioning:

Lists, make them, check off every item as you do it. Highest priority (as in my life will disintegrate if this does not get done) first and then so on. Be methodical no emothions just get it done.

A good therapist and medication. Some people can't stand it but it works for me

A support sytstem: It does not have to be a large group, one person or two, preferably someone who knows what mental illness is like.

Hope this helps